// Maintain the same error semantics as Class.forName()
if (className == null) {
throw new NullPointerException();
}
if (className.length() == 0) {
throw new ClassNotFoundException();
}
// It would be nice to bypass JDKClassLoader's attempts completely
// if it's known that the latest user defined ClassLoader will
// fail.
//
// Otherwise, we end up calling Class.forName here as well as in
// the next step in JDKBridge. That can take a long time depending
// on the length of the classpath.
// Note: Looking at the only place in JDKBridge where this code
// is invoked, it is clear that aClass will always be null.
ClassLoader loader;
if (aClass != null) {
loader = aClass.getClassLoader();
} else {
loader = bridge.getLatestUserDefinedLoader();
}
// See createKey for a description of what's involved
Object key = classCache.createKey(className, loader);
if (classCache.knownToFail(key)) {
throw new ClassNotFoundException(className);
} else {
try {
// Loading this class with the call stack
// loader isn't known to fail, so try
// to load it.
return Class.forName(className, false, loader);
} catch(ClassNotFoundException cnfe) {
// Record that we failed to find the class
// with this particular loader. This way, we won't
// waste time looking with this loader, again.
classCache.recordFailure(key);
throw cnfe;
}
}
